REVERSIBLE THYRISTOR DRIVE Russian patent published in 1997 - IPC

FIELD: automatic-control electric drives and converter engineering. SUBSTANCE: thyristor drive has converter whose output is meant for connecting motor or smoothing reactor and input is connected through current sensor to supply mains; control circuits of converter are connected to pulse-phase control system whose input is connected to regulator unit whose inputs are connected to current sensor, tachogenerator, and speed setting element; it also has logic unit connected to regulator unit and pulse-phase control system; in addition, it is provided with mode-of-operation selecting unit for thyristor set of converter whose inputs are connected to tachogenerator and logic unit and outputs, to inputs of pulse distributor of pulse-phase control system; mode-of-operation selecting unit for thyristor set of converter has two comparators, NAND and NOT gates, and diodes; each comparator has its input connected to inputs of NAND gates and output, to respective NOT gate; outputs of NOT gates are connected to diodes connected in pairs to inputs of pulse distributors of pulse-phase selecting system. EFFECT: improved performance characteristics of thyristor drive. 2 dwg